Although the health benefits of swimming are well-documented,health effects such as asthma and bladder cancer are linked to disinfection by-products(DBPs)in pool water.DBPs are formed from the reaction of disinfectants such as chlorine(Cl)or bromine(Br)with organics in the water.Our previous study(Daiber et al.,Environ.Sci.Technol.50,6652;2016)found correlations between the concentrations of classes of DBPs and the mu-tagenic potencies of waters from chlorinated or brominated swimming pools and spas.We extended this study by identifying significantly different concentrations of 21 individ-ual DBPs in brominated or chlorinated pool and spa waters as well as identifying which DBPs and additional DBP classes were most associated with the mutagenicity of these wa-ters.Using data from our previous study,we found that among 21 DBPs analyzed in 21 pool and spa waters,the concentration of bromoacetic acid was significantly higher in Br-waters versus Cl-waters,whereas the concentration of trichloroacetic acid was significantly higher in Cl-waters.Five Br-DBPs(tribromomethane,dibromochloroacetic acid,dibromoace-tonitrile,bromoacetic acid,and tribromoacetic acid)had significantly higher concentra-tions in Br-spa versus Cl-spa waters.Cl-pools had significantly higher concentrations of Cl-DBPs(trichloroacetaldehyde,trichloromethane,dichloroacetic acid,and chloroacetic acid),whereas Br-pools had significantly higher concentrations of Br-DBPs(tribromomethane,di-bromoacetic acid,dibromoacetonitrile,and tribromoacetic acid).The concentrations of the sum of all 4 trihalomethanes,all 11 Br-DBPs,and all 5 nitrogen-containing DBPs were each significantly higher in brominated than in chlorinated pools and spas.The 8 Br-DBPs were the only DBPs whose individual concentrations were significantly correlated with the muta-genic potencies of the pool and spa waters.These results,along with those from our earlier study,highlight the importance of Br-DBPs in the mutagenicity of these recreational waters.

Hannah K.Liberatore;Eric J.Daiber;Sridevi A.Ravuri;Judith E.Schmid;Susan D.Richardson;David M.DeMarini

Air Methods and Characterization Division,Centerfor Environmental Measurement and Modeling,U.S.Environmental Protection Agency,Research Triangle Park,NC 27711,USA;Student Services Authority,U.S.Environmental Protection Agency,National Exposure Research Laboratory,Athens,GA 30605,USA;National Health and Environmental Effects Research Laboratory,U.S.Environmental Protection Agency,Research Triangle Park,NC 27711,USA;Department of Chemistry and Biochemistry,University of South Carolina,Columbia,SC 29208,USA

环境科学学报（英文版）

[1]Hannah K.Liberatore;Eric J.Daiber;Sridevi A.Ravuri;Judith E.Schmid;Susan D.Richardson;David M.DeMarini-.Disinfection byproducts in chlorinated or brominated swimming pools and spas:Role of brominated DBPs and association with mutagenicity)[J].环境科学学报（英文版）,2022(07):253-263

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